Insulated conductor



March 4, 1930. 0. A. FREDERICKSON L J INSULATED CONDUCTOR Filed June 10,1926 A 7-70 RA/E Y Patented Mar. 4, 193d UNITEE STATES fiddled OTTG A.FREDERICK$N, F W'ETHEESFIELD, GQNIEEC IGUT, ASSIGNQDR 'LQ) THE WlIEll-MOLD COMPANY, OF HARTFORD, (JGNNEGTICUE, A (Z ENSULATED Applicationfiled dune ill,

This invention relates to a tubular braid adapted for use as aprotecting jacket for electrical conductors.

There is an urgent demand "for insulated electrical conductors that canbe supplied a very low cost. Such conductors are exten sively used inWiring buildings for electric bell circuits and for other purposes Wherea current of only a few volts is employed.

A rubber jacket applied to conductor Wires will insulate the Wiressuficiently for use in circuits having a low voltage, but the rubbercovering of an electrical conductor is easily damaged unless protectedby an enclosing Wrapper, and in order to protect the rubber j achet ofconductors it is customary to apply over the jacket a braided cottoncover.

Insulated conductors of the type above mentioned having a rubber jaclret protected by cotton braid are extensively used for many purposesWhere a low voltage is eraployed and such conductors are used to someextent in electric light circuits.

The present invention relates to insulated. conductors of the type abovementioned, and more particularly to a braided. jacket which is Welladapted for use on such" conductors to protect the insulating rubber.Que or the primary features of the present invention resides in abraided jacket that is constructed entirely of twisted strands of paper.Such paper jacket can be manufactured at a very low cost and is alsoextremely tough and durable in use. I

Another feature of the invention resides in a braided jacket that isformed entirely oi twisted paper strands that are disposed in spacedrelation to each other so that they produce an open braid havinginterstices between the strands of the braid. This open braid is in manycases desirable because of the rapidity with which it may be constructedand also oi the saving in material obtained by spacing the twistedstrands apart.

The various features of the invention will be best understood from thefollowing description when read in connection with the accompanyingdrawings; wherein,

Fig. 1 is a perspective View of an insulated lto. lllitl'lfl.

conductor covered with braid constructed in accordance With the presentinvention;

Fig. 2 is a transverse sectional vievv of Fig. l;

S is perspective View similar to Fig. l, but shows a modified type ofbraid.

Fig. is transverse sectional view of Fig, 3.

Although the braid forming the subjectmatter of the present invention isparticular ly Well adapted for use as a protecting cover ing for therubber jacket of a metallic elec= trical conductor it may be used forvarious purposes Where a tough, durable and inen pensive tubular braidis desired.

The n" allic conductor 10 is shown in the dravvingsasprovidedwith aninsulating et ll formed of rubber or otherfsuitable new terial thejacket 11 is protected by covering of braid constructed in accordanceWith the present invention. The b aided covering shown in Figs. 1 and 2is formed of series of strands 12 of twisted paper that extend spirallyabout the conductor in one direction and these strands are interbraidedwith the series of strands 13 of twisted paper that extend spirallyabout the conductor in the opposite direction.

The s -unds 1% are preferably positioned in spaced relation to eachother, and the same is true the strands 18, so that-an open braid isformed having interstices between the adjacent strands. Thisconstruction is desirable in many cases because of its econo my ofproduction due to the saving of material and rapidity With which thestrands can he braided many cases it is desirable to treat the paperstrands "l2 and 13 with a moisture proofing material so that the strandswill not rot or deteriorate upon exposure to moisture, and a Wan-likesubstance such as paraffine havin lubricating qualities is preferablyemployed the moisture proofing ma terial, because the appl cation ofparatiine to the paper strands materially increases the speed which theymay be braided, since the parafine irn a smooth surface to the pagerwhich enables it to be delivered smoothly to the braiding point by thebraiding machine at high speed.

if desired the interstices or apertures formed in the open braid may befilled .up b applyin any suitable coating material suc as ara ne orstearin pitch to the finished braid, so that it will lie in theinterstices as indicated by 14.

The braid shown in Figs. 3 and 4 differs from that disclosed in Figs. 1and 2 in that in the modified construction the twisted strands of paper15 that extend in one direction are larger in diameter than the twistedstrands of paper 16 that extend in the opposite direction; the strands15 however are shown as disposed in spaced relation to each, as are alsothe strands 16, so that openings or interstices are formed between thestran s 15 and 16 of the braid, as in Fig. 1.

From the foregoing it will be seen that an open braid constructedentirely of paper in accordance with the present invention will, form atough, durable protecting jacket for an insulated conductor, and thatthe braid can be produced rapidly and at low cost.

What is claimed is An article of manufacture comprising, in combination,an electrical conductor, a surrounding sheath of insulating material, aprotecting jacket formed about said sheath and comprising an opentubular braid of light weight formed of a series of parafiin treated,twisted strands of paper that extend spirally about said sheath 1n onedirection in spaced relation to each other and in terbraided with aseries of parafiin treated, twisted strands of paper that extendspirally about the sheath in the opposite direction in s aced relationto each other to form a tough, durable, open braid produced entirely ofpaper and having relatively large interstices between the strands, and afillin compound de osited in the interstices to orm a wall of insulationcompoundi'surrounding said sheath and which is protected from mechanicalinjury by the 0 en braid.

In testimony whereof, I ave signed my name to this s ecification.

OT 0 A. FREDERICKSON.

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